How to Fix the 'CD-ROM Repository No Longer Has a Release File' Warning in CasaOS

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If you are using CasaOS on a Linux distribution like Ubuntu and encounter the warning: “The repository ‘file:/cdrom noble Release’ no longer has a Release file,” don’t worry—this is a common issue that can be fixed easily. This problem arises because your package manager is trying to access a repository from a CD-ROM that no longer exists or wasn’t set up properly. In this post, we’ll walk you through the steps to resolve this issue.

Why Does This Warning Appear?

The message indicates that the system is looking for software packages in a location that doesn’t have a valid repository anymore – often from a CD-ROM that was used during installation but is not accessible now. This outdated repository reference causes warnings when running the apt update command.

Step-by-Step Solution

To fix this issue, you need to remove or comment out the reference to the CD-ROM repository in your system’s source list. Follow these steps:

Step 1: Edit the Sources List

The repositories are defined in files like /etc/apt/sources.list or under the /etc/apt/sources.list.d/ directory. To modify these files:

  1. Open the Terminal.

  2. Use a text editor, such as nano, to edit the main sources list:

    sudo nano /etc/apt/sources.list

    Alternatively, check the files in /etc/apt/sources.list.d/ if the entry is not in the main sources list:

    ls /etc/apt/sources.list.d/

Step 2: Locate and Comment Out CD-ROM Entries

In the file, look for any lines that start with deb cdrom: or refer to file:/cdrom. These entries are attempting to use a CD-ROM as a software repository. To stop this:

  • Comment out the line by adding a # at the beginning, like this:
    # deb cdrom:[Ubuntu 22.04 LTS _Noble_ - Release ...] / noble main restricted

Step 3: Save and Exit the File

  • To save the file in nano, press Ctrl + O and then press Enter.
  • To exit nano, press Ctrl + X.

Step 4: Update Your Package List

Now that you have removed the outdated reference, update your package list:

sudo apt update

The warning should no longer appear, and your package manager will work without interruptions.

Conclusion

This warning is a reminder to clean up any outdated or irrelevant entries in your system’s repository list. By following the simple steps above, you can ensure that your system’s package manager functions properly without looking for packages in non-existent locations. CasaOS, or any other Linux system, will then be able to fetch updates and install new software smoothly.

Have you encountered other similar issues? Feel free to share in the comments below.